[s-cars] ABS Off Light Problem - VAG COM

Thu Sep 17 12:44:47 PDT 2009

If memory serves me correctly (IMSMC), Scott did weigh in on this thread and indicated the use of a multimeter using one of the rear sensors as the baseline.? Again, IMSMC.

Mark

-----Original Message-----
From: Theodore Chen <tedebearp at yahoo.com>
To: Theodore Chen <tedebearp at yahoo.com>; Brian Armstead <barmstea at voanews.com>; Tom Green <trgreen at comcast.net>
Cc: Scarlist <s-car-list at audifans.com>
Sent: Thu, Sep 17, 2009 3:01 pm
Subject: Re: [s-cars] ABS Off Light Problem - VAG COM

I got to a PC and can finally read the entire email, instead of just a little 
piece of it on my Blackberry.

Ian was talking about a connector in the center console, not engine compartment.  
So the connector behind the AC is not the one for the ABS controller, and there 
doesn't seem to be a way to communicate with the ABS controller other than 
through the ECU.

I found an old email from Scott Mockry, in which he said the pre 94 year S4's 
don't have the diagnostic capability,
which makes it a pain to diagnose ABS problems.

Seems like the only way to do it is with an oscilloscope.  Anybody tried this?

----- Original Message ----
From: Theodore Chen <tedebearp at yahoo.com>
To: Brian Armstead <barmstea at voanews.com>; Tom Green <trgreen at comcast.net>
Cc: Scarlist <s-car-list at audifans.com>
Sent: Thursday, September 17, 2009 11:16:07 AM
Subject: Re: [s-cars] ABS Off Light Problem - VAG COM

I apologize in advance if I am asking inane questions, but I appear to be 
missing emails as I am seeing replies to email that I haven't seen on the list.

To recap:
The 2x2 connector for the ABS is behind the AC.  If there is no communication 
with the ABS controller, the control module is faulty.  It is located under the 
rear seat.  

Does this apply to the '92 S4 as well?  Do they all have the same ABS controller 
(except possibly for the later models with EDL)?

----- Original Message ----
From: Brian Armstead <barmstea at voanews.com>
To: Tom Green <trgreen at comcast.net>
Cc: Scarlist <s-car-list at audifans.com>
Sent: Thursday, September 17, 2009 6:53:01 AM
Subject: Re: [s-cars] ABS Off Light Problem - VAG COM

Thanks Tom.  I'll see if I can track one down.

Brian

Tom Green wrote:
> Brian,
>
> The lack of communication with the ABS points to a faulty electronic 
> control
> module under the rear seat.  The best course may be to source one from 
> the
> many cars being parted out.  My guess is they are common until the 
> 95.5 model.
> It is easy to access under the back seat to confirm part numbers.
>
> Tom
>
> On Sep 17, 200
9, at 9:19 AM, Brian Armstead wrote:
>
>> Thanks for your reply Tom.  Mark did clear all codes, but the light 
>> remains on...
>>
>> Brian
>>
>> Tom Green wrote:
>>> I had mentioned in the fine print that some S4 owners were having  
>>> problems
>>> scanning the ABS module.   I guess we need an affirmation from at  
>>> least one
>>> that they can scan the module.
>>>
>>> I believe Ian has the Airbag control module mixed up with the ABS.  
>>> The airbag
>>> controller and connectors for early models are indeed in the center  
>>> console.  The
>>> ABS electronic controller is under the rear seat, drivers side.  I  
>>> know of no direct
>>> reading connectors for VAG-COM, though.  The fault codes are stored 
>>> in  the ECU.
>>>
>>> It could be that the fault has been corrected but the fault remains  
>>> until cleared in
>>> the ECU.  Try clearing all the codes and perhaps the light will 
>>> clear  also.
>>>
>>> Tom
>>>
>>>
>>>> -----Original Message-----
>>>> Date: Wed, 16 Sep 2009 20:50:34 -0400
>>>> From: "Mark Pollan" <mpollan1 at aol.com>
>>>> Subject: Re: [s-cars] ABS Off Light Problem - VAG COM
>>>> To: <s-car-list at audifans.com>
>>>> Message-ID: <c3c.617310ad.37e2e1e4 at aim.com>
>>>> Content-Type: text/plain;    charset="us-ascii"
>>>>
>>>> Gents:
>>>>
>>>> I met up with Brian this evening to pull codes and I could not 
>>>> read/ connect
>>>> to the ABS module.  I first ran Autoscan and some trivial codes 
>>>> came  up but
>>>> no reading on ABS.  Going directly to the ABS module and no  
>>>> connection.  I
>>>> tried several times to no avail.  I have access to an old HEX COM  
>>>> with the
>>>> OBD II connector and the 2x2 adapter dongle.  I would have 
>>>> suspected  the
>>>> dongle but connection was established with other controllers.
>>>>
>>>> Thoughts?  Is it possible the controller itself is messed up?  I  
>>>> rang up
>>>> Mark Turczyn as I had already pestered Manny Sanchez and Mark 
>>>> though  maybe
>>>> the no read condition is due to a bad connection to the ABS controller
>>>> itself.
  Seem plausible?  Where might the controller be located as 
>>>> I  gifted
>>>> my Bentley to Mark when I sold the S6.
>>>>
>>>> Any and all insights are greatly appreciated.  Brian is a hell of 
>>>> a  nice guy
>>>> and I'd love to see this to closure but your help is definitely  
>>>> needed.
>>>>
>>>> Thanks in advance,
>>>>
>>>> Mark
>>>>
>>>
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>>>
>
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